Ticket approvals

If we have tickets that require approval in support desk, does the approver and the creator of the ticket both see the updates on the ticket as it goes through the workflow or is it just the creator that will see the updates?

Also we are looking at creating linked issues between support desk and JIRA software, is there away of keeping the tickets between the two in sync, so when the work is complete in JIRA software it will move the flow to the next stage in support desk?